Service manual

13 – 3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
displayed motor current may still be off slightly. In this
case reenter the desired value and the displayed value
should get progressively closer.
4-20mA Scale:
• 4mA:
• Not editable by the operator. Defi nes the
minimum value in amps represented by a 4ma
inputs.
• 20mA:
• Defi nes the maximum value in amps repre-
sented by a 20ma inputs.
• Enter Desired Value:
• The operator enters the correct current value.
Each entry will recalculate the point-slope calcu-
lations of the current calibration.
• Total Error:
• Not editable by the operator. Displays the
total error offset of entries from the “Enter
Desired Value” setpoint.
Current Transformer Ratio:
• Primary
• Defi nes the upper value of the current
transformer.
• Secondary:
• Not editable by the operator. Defi nes the
minimum value of the current transformer.
• Enter Desired Value:
• The operator enters the value of the cor-
rect current value. Each entry will recalculate
the point-slope calculations of the current
calibration.
• Total Error:
• Not editable by the operator. Displays the to-
tal error offset of entries from the “Enter Desired
Value” setpoint
Section 13 • Instruments Calibration
Figure 13-3. Instruments Calibration Screen - Analog Inputs (Page 3)